Struct wasmtime_runtime::VMHostFuncContext

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#[repr(C)]
pub struct VMHostFuncContext { /* private fields */ }
Expand description

The VM*Context for host functions.

Its magic field must always be wasmtime_environ::VM_HOST_FUNC_MAGIC, and this is how you can determine whether a VM*Context is a VMHostFuncContext versus a different kind of context.

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impl VMHostFuncContext

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pub unsafe fn new( host_func: NonNull<VMFunctionBody>, signature: VMSharedSignatureIndex, host_state: Box<dyn Any + Send + Sync>, ) -> Box<VMHostFuncContext>

Create the context for the given host function.

§Safety

The host_func must be a pointer to a host (not Wasm) function and it must be Send and Sync.

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pub fn wasm_to_host_trampoline(&self) -> NonNull<VMCallerCheckedFuncRef>

Get the Wasm-to-host trampoline for this host function context.

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pub fn host_state(&self) -> &(dyn Any + Send + Sync)

Get the host state for this host function context.

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impl VMHostFuncContext

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pub unsafe fn from_opaque( opaque: *mut VMOpaqueContext, ) -> *mut VMHostFuncContext

Helper function to cast between context types using a debug assertion to protect against some mistakes.

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